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Finding the Fourth Proportional to 803.68, 1,203.70 and 560.40

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Solution

The fourth proportional to 803.68, 1,203.70 and 560.40 is: 839.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    803.68 : 1,203.70 = 560.40 : x
  2. Step 2: Convert to fraction form
    803.68/1,203.70 = 560.40/x
  3. Step 3: Cross multiply
    803.68x = 1,203.70 × 560.40
  4. Step 4: Simplify right side
    803.68x = 674,553.48
  5. Step 5: Solve for x
    x = 674,553.48/803.68
  6. Step 6: Final answer
    x = 839.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.